酸性离子液体催化蔗糖转化合成5-羟甲基糠醛

摘要

研究了离子液体催化蔗糖合成5-羟甲基糠醛的反应过程.合成并表征了N-甲基吡咯烷酮甲磺酸盐和N-甲基吡咯烷酮硫氢酸盐两种离子液体,并考察了两种离子液体在N,N-二甲基甲酰胺-溴化锂(DMF-LiBr)溶剂体系中催化蔗糖合成5-羟甲基糠醛的反应情况.结果表明,N-甲基吡咯烷酮甲磺酸盐催化效果较好,氮气保护下,在反应温度85℃、反应时间60 min和加入催化剂N-甲基吡咯烷酮甲磺酸盐占蔗糖物质的量的10.0%条件下,蔗糖脱水生成5-羟甲基糠醛的收率可达48.2%.%The synthesis of 5-hydroxymethylfurfural was studied using sucrose as mw material and ionic liquids as the catalysts. The ionic liquids including N-methyl-2-pyrrolidonium methyl sulfonate and N-methyl-2-pyrrolidonium hydrogen suffate was synthesized and characterized, and the catalytic dehydration of sucrose by these ionic liquids was investigated. The results indicated that N-methyl-2-pyrrolidonium methyl sulfonate exhibited better catalytic properties and 5-hydroxymethyffuffural yield of 48.2％ was obtained under the condition as follows: reaction time 60 rain, reaction temperature 85 ℃, N2 atmosphere,N-methyl-2-pyrrolidonium methyl sulfonate dosage 10.0％ (mole fraction) of sucrose and N, N-dimethylformamide-lithium bromide (DMF-LiBr) as the solvent.